.body{
    width: 100vw;
    height: 100vh;
    background-color: black;
}
span {
    /* 让弹出来的文字不被选中，影响操作体验 */
    user-select: none;
    cursor: default;
    font-size: 20px;
    color: blanchedalmond;
    position: absolute;
    transition: 1s;
    /* F12不可选中 */
    pointer-events: none;
}